package com.hp.test.java.encode;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.Security;

/**
 * 字符串 DESede(3DES) 加密
 *
 * @author hupan
 * @version 1.0
 * @created 2015-6-9 上午9:22:13
 */

public class DES3 {

    private static final String Algorithm = "DESede"; // 定义 加密算法,可用

    // DES,DESede,Blowfish
    // keybyte为加密密钥，长度为24字节
    // src为被加密的数据缓冲区（源）
    public static byte[] encryptMode(byte[] keybyte, byte[] src) {
        try {
            // 生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
            // 加密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.ENCRYPT_MODE, deskey);

            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e) {

            e.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e) {

            e.printStackTrace();
        } catch (java.lang.Exception e) {

            e.printStackTrace();
        }

        return null;
    }

    // keybyte为加密密钥，长度为24字节 // src为加密后的缓冲区
    public static byte[] decryptMode(byte[] keybyte, byte[] src) {
        try {
            // 生成密钥
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
            // 解密
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.DECRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    // 转换成十六进制字符串
    public static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1)
                hs = hs + "0" + stmp;
            else
                hs = hs + stmp;
            if (n < b.length - 1)
                hs = hs + ":";
        }
        return hs.toUpperCase();
    }

    public static void main(String[] args) {

        // 添加新安全算法,如果用JCE就要把它添加进去
        Security.addProvider(new com.sun.crypto.provider.SunJCE());
        // 24字节的密钥
        final byte[] keyBytes = {
                0x11,
                0x22,
                0x4F,
                0x58,
                (byte) 0x88,
                0x10,
                0x40,
                0x38,
                0x28,
                0x25,
                0x79,
                0x51,
                (byte) 0xCB,
                (byte) 0xDD,
                0x55,
                0x66,
                0x77,
                0x29,
                0x74,
                (byte) 0x98,
                0x30,
                0x40,
                0x36,
                (byte) 0xE2
        };

        String szSrc = "This is a 3DES test. 测试";
        System.out.println("加密前的字符串:" + szSrc);

        byte[] encoded = encryptMode(keyBytes, szSrc.getBytes());
        System.out.println("加密后的字符串:" + new String(encoded));

        byte[] srcBytes = decryptMode(keyBytes, encoded);
        System.out.println("解密后的字符串:" + (new String(srcBytes)));
    }
}
